calculator
Free Cohort Retention & LTV Calculator
Project lifetime value and revenue decay from a single user cohort using realistic retention curves. Fits a power-law decay through your three observed retention points (M1, M3, M12) instead of assuming flat retention. Calculates 24-month LTV, payback period, magic number against CAC, and the cumulative revenue curve a board deck actually wants to see.
Inputs
Results
Fitted Power-Law Decay Exponent
0
Projected Month 24 Retention
28.8%
Projected Month 36 Retention
25.8%
Average Months Active per Cohort User
9
24-Month LTV per User (Gross Margin)
$395
LTV:CAC Ratio (24-Month)
2
CAC Payback (Months)
14
24-Month Cumulative Cohort Revenue
$506,019
Cohort Contribution Margin (Net of CAC)
$154,695
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About the Author
David Shadrake
David Shadrake works on strategic business development and tech partnerships, with focus areas across AI, fintech, venture capital, growth, sales, SEO, blockchain, and broader tech innovation. Read more of his perspective on partnerships, market dynamics, and emerging technology at davidshadrake.com.